| 低活化铁素体/马氏体钢的增强机理研究进展 |
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| 作者单位： | Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education),School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;The State Key Lab of Rolling & Automation,Northeastern University,Shenyang 110819,China;Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education),School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China |
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| 基金项目： | and the 111 Project ;This project is supported by the National Key Research and Development Program of China ;the Fundamental Research Funds for the Central Universities ;the National Natural Science Foundation of China |
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| 摘 要： | This review summarizes the strengthening mechanisms of reduced activation ferritic/martensitic (RAFM) steels. High-angle grain boundaries, subgrain boundaries, nano-sized M23C6, and MX carbide precipitates effectively hinder dislocation motion and increase high-temperature strength. M23C6 carbides are easily coarsened under high temperatures, thereby weakening their ability to block dislocations. Creep properties are improved through the reduction of M23C6 carbides. Thus, the loss of strength must be compensated by other strengthening mechanisms. This review also outlines the recent progress in the development of RAFM steels. Oxide dispersion-strengthened steels prevent M23C6 precipitation by reducing C content to increase creep life and introduce a high density of nano-sized oxide precipitates to offset the reduced strength. Severe plastic deformation methods can substantially refine subgrains and MX carbides in the steel. The thermal deformation strengthening of RAFM steels mainly relies on thermo-mechanical treatment to increase the MX carbide and subgrain boundaries. This procedure increases the creep life of TMT(thermo-mechanical treatment) 9Cr–1W–0.06Ta steel by ~20 times compared with those of F82H and Eurofer 97 steels under 550°C/260 MPa.
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| 关 键 词： | ,,,,,,, |
Strengthening mechanisms of reduced activation ferritic/martensitic steels:A review |
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| Authors: | Jin-hua Zhou Yong-feng Shen Nan Jia |
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| Abstract: | This review summarizes the strengthening mechanisms of reduced activation ferritic/martensitic (RAFM) steels. High-angle grain boundaries, subgrain boundaries, nano-sized M23C6, and MX carbide precipitates effectively hinder dislocation motion and increase high-tem-perature strength. M23C6 carbides are easily coarsened under high temperatures, thereby weakening their ability to block dislocations. Creep properties are improved through the reduction of M23C6 carbides. Thus, the loss of strength must be compensated by other strengthening mech-anisms. This review also outlines the recent progress in the development of RAFM steels. Oxide dispersion-strengthened steels prevent M23C6 precipitation by reducing C content to increase creep life and introduce a high density of nano-sized oxide precipitates to offset the reduced strength. Severe plastic deformation methods can substantially refine subgrains and MX carbides in the steel. The thermal deformation strengthening of RAFM steels mainly relies on thermo-mechanical treatment to increase the MX carbide and subgrain boundaries. This pro-cedure increases the creep life of TMT(thermo-mechanical treatment) 9Cr-1W-0.06Ta steel by ～20 times compared with those of F82H and Eurofer 97 steels under 550℃/260 MPa. |
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| Keywords: | reduced activation ferritic/martensitic steel strengthening mechanism high-angle grain boundary subgrain boundary precipitate |
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